test(e2e): author 2026-era sibling rows for push-style sampling/elicitation/roots and list_changed publish

14 new addedInSpecVersion:'2026-07-28' rows on entryModern, supersedes-linked
to 19 retired 2025-shape source rows (removedInSpecVersion + supersededBy):

MRTR siblings (inputRequired() bodies):
  sampling:mrtr:create:{basic,model-preferences,system-prompt,include-context}
  elicitation:mrtr:form:{basic,action:decline,action:cancel,schema:primitives}
  roots:mrtr:list:{basic,empty}

listen siblings (handler.notify.* bodies):
  {tools,resources,prompts}:listen:list-changed
  client:listen:auto-refresh

The 2025 source rows keep their bodies and stateful-transport cells on the
2025-11-25 axis; the 2026-07-28 axis is now covered by the dedicated sibling
bodies that exercise the era's actual API shape (inputRequired() / handler.notify)
instead of duplicate-registering the 2025 push-API body under a 2026 label.

Author: felixweinberger